To be honest I doubt it - I expect you are talking a serious amount of $$ for something like that? I'd love it though
The boating fraternity here tend to be small in number and not all that rich, it is not difficult to ship RIBs from the UK, just expensive (a couple of grand) but in the context of the cost of a new RIB that is not too much - something like a new Humber or (dons hard hat and frantically starts digging trench for shelter) Leeway would be well worth the freight cost to ship down, just that older second hand ones don't make much sense as the freight still costs the same!
But basically it simply isn't a very popular pastime here - though having got a few hours under my belt I don't know why - I love it
Maybe partly because the facilities aren't good, basically if it breaks you fix it yourself or go without (same with many things) and storage/launching facilities are fairly limited.